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An in-depth exploration of computer sound, focusing on the four essential components for capturing and outputting sound: sound card, speakers, microphone, and recording/playback software. Learn about the digitization process, sound card jacks, speaker technologies, and sound formats such as wav, mp3, and midi.
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Computer Sound October 23 (Day); October 10 (Night) There are four components for capturing and outputting sound on a computer (p. 341): o Sound card o Speakers o Microphone o Recording / playback software
from a computer. o Sound passes through three stages when it is computerized:
converting of the analog sound waves into binary 1s and 0s. Store digital data in compressed data file.
digital 1s and 0s into analog sound waves that can be played through the speakers. o Jacks: Virtually every sound card comes with at least three connections (p. 347):
cassette or CD player and output sounds from your computer through that device.
cassette or CD player and input sounds from that device.
Sound Card Jacks o Most sound cards have a game controller port for connecting joysticks, gamepads, etc. o Speakers:
world. It consists of two speakers – a left and a right – that share a common jack (p. 349).
subwoofer connected to a shared jack (p. 349).
low-frequency tones (p. 345).
front-center, rear-left, and rear-right (p. 349). Sound Capture:
sampling. Sampling is the process of taking samples of the sound at certain intervals. The more samples you take, the better your sound will be. The more samples you take, however, the more space it will require (p. 341).
second, or kilohertz, KHz (p. 341). Sounds have three primary characteristics that have to be digitized: Loudness Tone
Sound Formats: o A four-minute WAV formatted song can take up to 40+ megabytes to store (p. 342) meaning that it typically takes 650 MB to store an entire CD of music. o The human ear cannot hear nearly all of the small variations of sound recorded at 44 KHz and 16-bit depth. Therefore, programmers have created programs to throw out the unnecessary characteristics of a file (p. 342).
o Popular formats include MP3, ASX, and RM (pp. 342-344). MIDI:
instructions that tell the sound card what notes to play, how long, how loud, which instruments, etc (p. 343). o MIDI files are small, but lack quality (p. 343).